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C# TextBox Controls - GeeksforGeeks

Last Updated : 25 Mar, 2025

In Windows forms, TextBox plays an important role. With the help of TextBox, the user can enter data in the application, it can be of a single line or multiple lines. The TextBox is a class and it is defined under System.Windows.Forms namespace.

There are mainly two ways to create a TextBox in Windows forms which are mentioned below.

• Drag and drop (Design-Time)
• Custom TextBox (Run-Time)

This is the easiest way to create a TextBox in Windows Forms using Visual Studio we just have to open the toolbox and drag and drop the text box on the form in the designer and further we can change the appearance of the TextBox using the properties. Follow these steps to create a TextBox.

Step 1: Now locate the project with the name here we are using the default name which is Form1 and it will open a form in the editor that we can further modify.

In the image, we have two files that are open one Design and there is Form1.cs these two play a major role. We use the Form 1.cs file for the custom logic.

Step 2: Now open a Toolbox go to the view > Toolbox or ctrl + alt + x.

Step 3. Now open the common controls and drag and drop the TextBox on the form where we want to it be placed.

Step 4. Now open the properties of the TextBox press right-click on the TextBox and it will open the properties solution explorer now we can change the button appearance of the textbox and also add different properties like default text.

Output:

In this method, we are going to modify the Form1.cs file and add custom code modification in C# with the help of the TextBox class. The following steps show how to create a TextBox dynamically:

Step 1: Create a textbox using the TextBox() constructor provided by the TextBox class.

// Creating textbox

TextBox Mytextbox = new TextBox();

Step 2: After creating TextBox, set the properties of the TextBox provided by the TextBox class.

// Set location of the textbox

Mytextbox.Location = new Point(187, 51);

// Set background color of the textbox

Mytextbox.BackColor = Color.LightGray;

// Set the foreground color of the textbox

Mytextbox.ForeColor = Color.DarkOliveGreen;

// Set the size of the textbox

Mytextbox.AutoSize = true;

// Set the name of the textbox

Mytextbox.Name = "text_box1";

Step 3: And last add this textbox control to form using Add() method.

// Add this textbox to form

this.Controls.Add(Mytextbox);

Step 4: Now double-click on the form in Design and it will open the Form1.cs file where code is written in C#. Here the program file is Form 1.cs Now write this code in Form1.cs file

Form1.cs file:

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Creating and setting the properties of Label
            Label myLabel = new Label();
            myLabel.Location = new Point(96, 54);
            myLabel.Text = "Enter Your Name";
            myLabel.AutoSize = true;
            myLabel.BackColor = Color.LightGray;

            // Add this label to form
            this.Controls.Add(myLabel);

            // Creating and setting the properties of TextBox
            TextBox myTextBox = new TextBox();
            myTextBox.Location = new Point(187, 51);
            myTextBox.BackColor = Color.LightGray;
            myTextBox.ForeColor = Color.DarkOliveGreen;
            myTextBox.AutoSize = true;
            myTextBox.Name = "textBox1"; 

            // Add this textbox to form
            this.Controls.Add(myTextBox);
        }
    }
}

Output:

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